How do I convert psi to millimeters of mercury?

Multiply the value in psi by the conversion factor. For example, 10 psi = 517.149252 mmHg. Use our calculator above for instant results.

Is the psi to millimeters of mercury conversion exact?

This conversion uses NIST SP 811 factors with 10-digit precision, which is more than sufficient for all practical purposes.

Can I convert psi to millimeters of mercury offline?

Yes! OmniConvert runs entirely in your browser — no internet connection needed after the page loads. Your data never leaves your device, ensuring complete privacy.

What is the difference between psi and millimeters of mercury?

PSI (psi) and Millimeters of Mercury (mmHg) are both units of pressure but belong to different measurement systems. 1 psi = 51.7149252 mmHg. Use the converter above to switch between them instantly.

PSI to Millimeters of Mercury (psi → mmHg) — Free Online Converter

psi → mmHg Reference Table

psi	mmHg
0.001 psi	0.0517149252 mmHg
0.002 psi	0.1034298504 mmHg
0.003 psi	0.1551447756 mmHg
0.004 psi	0.2068597008 mmHg
0.005 psi	0.258574626 mmHg
0.006 psi	0.3102895512 mmHg
0.007 psi	0.3620044764 mmHg
0.008 psi	0.4137194016 mmHg
0.009 psi	0.4654343268 mmHg
0.01 psi	0.517149252 mmHg
0.02 psi	1.034298504 mmHg
0.03 psi	1.551447756 mmHg
0.04 psi	2.068597008 mmHg
0.05 psi	2.58574626 mmHg
0.06 psi	3.102895512 mmHg
0.07 psi	3.620044764 mmHg
0.08 psi	4.137194016 mmHg
0.09 psi	4.654343268 mmHg
0.1 psi	5.17149252 mmHg
0.2 psi	10.34298504 mmHg
0.3 psi	15.51447756 mmHg
0.4 psi	20.68597008 mmHg
0.5 psi	25.8574626 mmHg
0.6 psi	31.02895512 mmHg
0.7 psi	36.20044764 mmHg
0.8 psi	41.37194016 mmHg
0.9 psi	46.54343268 mmHg
1 psi	51.7149252 mmHg
1.5 psi	77.57238781 mmHg
2 psi	103.4298504 mmHg
2.5 psi	129.287313 mmHg
3 psi	155.1447756 mmHg
3.5 psi	181.0022382 mmHg
4 psi	206.8597008 mmHg
4.5 psi	232.7171634 mmHg
5 psi	258.574626 mmHg
5.5 psi	284.4320886 mmHg
6 psi	310.2895512 mmHg
6.5 psi	336.1470138 mmHg
7 psi	362.0044764 mmHg
7.5 psi	387.861939 mmHg
8 psi	413.7194016 mmHg
8.5 psi	439.5768642 mmHg
9 psi	465.4343268 mmHg
9.5 psi	491.2917894 mmHg
10 psi	517.149252 mmHg
11 psi	568.8641772 mmHg
12 psi	620.5791024 mmHg
13 psi	672.2940277 mmHg
14 psi	724.0089529 mmHg
15 psi	775.7238781 mmHg
16 psi	827.4388033 mmHg
17 psi	879.1537285 mmHg
18 psi	930.8686537 mmHg
19 psi	982.5835789 mmHg
20 psi	1034.298504 mmHg
25 psi	1292.87313 mmHg
30 psi	1551.447756 mmHg
35 psi	1810.022382 mmHg
40 psi	2068.597008 mmHg
45 psi	2327.171634 mmHg
50 psi	2585.74626 mmHg
55 psi	2844.320886 mmHg
60 psi	3102.895512 mmHg
65 psi	3361.470138 mmHg
70 psi	3620.044764 mmHg
75 psi	3878.61939 mmHg
80 psi	4137.194016 mmHg
85 psi	4395.768642 mmHg
90 psi	4654.343268 mmHg
95 psi	4912.917894 mmHg
100 psi	5171.49252 mmHg
120 psi	6205.791024 mmHg
125 psi	6464.36565 mmHg
130 psi	6722.940277 mmHg
140 psi	7240.089529 mmHg
150 psi	7757.238781 mmHg
160 psi	8274.388033 mmHg
175 psi	9050.111911 mmHg
180 psi	9308.686537 mmHg
200 psi	10342.98504 mmHg
225 psi	11635.85817 mmHg
250 psi	12928.7313 mmHg
275 psi	14221.60443 mmHg
300 psi	15514.47756 mmHg
350 psi	18100.22382 mmHg
400 psi	20685.97008 mmHg
450 psi	23271.71634 mmHg
500 psi	25857.4626 mmHg
600 psi	31028.95512 mmHg
700 psi	36200.44764 mmHg
750 psi	38786.1939 mmHg
800 psi	41371.94016 mmHg
900 psi	46543.43268 mmHg
1000 psi	51714.9252 mmHg
1200 psi	62057.91024 mmHg
1250 psi	64643.6565 mmHg
1500 psi	77572.38781 mmHg
1750 psi	90501.11911 mmHg
2000 psi	103429.8504 mmHg
2500 psi	129287.313 mmHg
3000 psi	155144.7756 mmHg
4000 psi	206859.7008 mmHg
4500 psi	232717.1634 mmHg
5000 psi	258574.626 mmHg
6000 psi	310289.5512 mmHg
7000 psi	362004.4764 mmHg
7500 psi	387861.939 mmHg
8000 psi	413719.4016 mmHg
9000 psi	465434.3268 mmHg
10000 psi	517149.252 mmHg
15000 psi	775723.8781 mmHg
20000 psi	1034298.504 mmHg
25000 psi	1292873.13 mmHg
50000 psi	2585746.26 mmHg
75000 psi	3878619.39 mmHg
100000 psi	5171492.52 mmHg

Why Convert PSI to Millimeters of Mercury?

Converting between psi (psi) and millimeters of mercury (mmHg) is one of the most common pressure conversions. Whether for engineering, cooking, travel, or science, knowing how to quickly convert psi to mmHg saves time and prevents errors.

Pressure conversions between psi and mmHg are vital in automotive maintenance, meteorology, and scuba diving. Tire pressure affects fuel efficiency and safety, requiring drivers to convert between PSI and bar depending on the gauge used. Divers must strictly monitor pressure to avoid decompression sickness, often needing to convert depth and tank pressure readings. In weather forecasting, atmospheric pressure changes indicate approaching storms, with data often shared in different units globally. Failing to convert pressure accurately can lead to equipment failure, tire blowouts, or life-threatening situations underwater.

How to Convert PSI to Millimeters of Mercury

To convert psi to millimeters of mercury, use the following formula:

mmHg = psi × 51.7149252

Example: 1 psi = 51.7149252 mmHg

For example, 5 psi = 258.574626 mmHg, 10 psi = 517.149252 mmHg, and 100 psi = 5171.49252 mmHg. For larger values, 1000 psi = 51714.9252 mmHg. Conversely, 1 mmHg = 0.01933677746 psi. Our calculator above performs this conversion instantly with full precision — no rounding errors.

Common Mistakes to Avoid

Gauge vs Absolute: confusing gauge pressure (psig) with absolute pressure (psia).
Bar vs Pascal: 1 Bar is 100,000 Pascals, not 10 or 100.
Atmosphere variations: confusing standard atm with technical atm.

Pro Tips

Tire checks: Check tire pressure when cold (tires heat up and pressure rises while driving).
PSI rule: Typical car tires are 30-35 PSI.
Altitude effect: Air pressure drops as you go higher (ears popping).

What is a PSI?

PSI (Pounds per Square Inch) is a unit of pressure in the Imperial and US customary systems. It represents the force of one pound-force applied to an area of one square inch.

PSI is the standard unit for tire pressure, industrial hydraulics, and compressed gas systems in the United States and UK.

What is a Millimeter of Mercury?

Millimeter of mercury.

Blood pressure and vacuum systems.

PSI → Millimeters of Mercury

PSI to Millimeters of Mercury Formula